Many of his teachers quit and get screwed out of their contracts and bonuses.

I don't know Miyauchi, but if you quit a contract you don't get your contract completion bonus (hence the name).

Quote:

Many of his teacher's arrive and are placed in filthy apartments without any of the necessities for life. He has given teacher's used and moldy bedding, and deprived them of heat and many other things westerner's take for granted.